Contextual Components Positional Params Issue (Not Working)

application.template.hbs

{{#parent-component as |component|}}
  {{component.childComponent "param1" "param2"}}
{{/parent-component}}

child-component.component.js

import Ember from 'ember';

const childComponent = Ember.Component.extend({});

childComponent.reopenClass({
	positionalParams: "params"
})

export default childComponent;

child-component.template.hbs

Positional Params: {{params}}

parent-component.template.hbs

{{yield (hash childComponent=(component "child-component"))}}

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "beta",
    "ember-template-compiler": "beta"
  }
}